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Chemical modification indicated that the arginine and tryptophan were essential for the hemagglutination activity of ZCA.

采用不同的化学修饰试剂对玉帘凝集素中的不同氨基酸侧链基团进行修饰。

The effect of chemical modification of amino acid residues upon hemagglutination was investigated.

NBS修饰Trp结果表明，在天然状态下有3个色氨酸分子被修饰，其中第二和第三个色氨酸分子对其活性至关重要。

It is found that the concentration of sulfuric acid in liquid and the reaction temperature are the most sensitive factors for this process. Increasing the ratio of solid to liquid is disadvantageous for growth of crystals even though it does not effect obviously for the rate of dehydration of FGD gypsum. On the other hand,the more closed to the neutral range of pH value the liquid is adjusted,the better stability of the α-form calcium sulfate hemihydrate appear,the more favorable for modification of crystal habit the process is made.

研究中发现pH值和盐溶液浓度是影响FGD石膏脱水速度最敏感的因素，固液比虽然对脱水速度影响不大，但固液比增大对晶体生长和习性改良不利。pH值愈接近中性范围，愈能增强α半水石膏结晶在液相中的稳定性，有利于结晶习性改良。

A retrospective study design was conducted by using chart reviews to choose patients who received unilateral primary total hip and knee replacement (International Classification of Diseases, Ninth Revision, Clinical Modification procedure code of 81.51 and 81.54) in two medical centers between 2001 and 2004. Patients were excluded from the study if they had had a bilateral in the same admission, fractures, previous arthroplasty surgery complication, bone cancer, pathological fractures, infection and hemophiliac.

采回溯性病历审查方式，选择台湾地区两家医学中心施行全人工髋及膝关节置换术的全部医师作为研究医师，以ICD-9-CM中之主手术码为81.51及81.54，排除符合同次住院施行双侧、骨折、先前手术的并发症、骨癌、病理性骨折、感染、血友病条件后，分别为716名及1，498名接受初次全人工髋及膝关节置换的病患。

In previous work of helicid's structure modification show that 4 substituted groups of helicid are some ordinary acyclic and substituted aniline group, and it had no heptad heterocyclic substituted group.

在前期的豆腐果苷结构修饰工作中，豆腐果苷4位取代基多为一些简单的脂肪族、取代苯胺基等，尚无七元杂环作为取代基的此类化合物。

The effects of different factors on the laser-induced graft polymerization on the PET surface were analyzed, and the mechanisms were discussed. The factors were: 1 Monomers with smaller molecules resulted in better modification than polymeric monomers. Acrylamide monomer was chosen as hydrophilic modifier finally; 2 Higher concentration of the monomer solution favored the graft reaction; 3 With the increasing laser fluence, the surface hydrophilicity of PET films increased at first, then decreased. More laser pulses led to a more hydrophilic surface; 4 Benzophenone as a photosensitizer hindered the graft polymerization; 5 The homopolymer retardant of ammonium iron sulfate hexahydrate in a proper concentration retarded the formation of homopolymers and promotes the graft copolymerization; 6 The solvent of monomer solution also affected the graft reaction. Different solvents functioned in different ways. Ethanol can promote the graft reaction because of the activity of hydrogen in its structure; 7 pH value of the monomer solution affects the polymerization rate, and a lower pH value was favorable to the graft reaction.

这些影响因素的作用分别为：1小分子单体的表面改性效果好，确定以丙烯酰胺为亲水性改性单体；2较高的单体溶液浓度有利于接枝反应；3激光能量密度增大，薄膜表面亲水性先显著增强，后又减弱；激光脉冲次数越多，改性后表面亲水性越强；4光敏剂BP对PET表面接枝聚合反应有阻碍作用；5适当浓度的均聚物抑制剂六水合硫酸铁铵能减少单体均聚物的生成，促进接枝聚合；6单体溶液的溶剂也影响接枝聚合的反应进程，不同溶剂的影响作用原理不同，含较活泼氢的乙醇能促进接枝反应；7溶液pH值影响单体聚合速率，pH值较低有利于接枝反应。

Mining and integration of histone modification data can be beneficial to novel biological discoveries.

组蛋白修饰数据的挖掘和整合能够有益于新颖的生物学发现。

The changes of epigenetics such as DNA methylation and histone modification can regulate the expression of genes and play an important role in the development of tumors.

表遗传学改变，如DNA甲基化和组蛋白修饰改变可以调节基因的表达，在肿瘤的发生和发展中可能起关键作用。

Based on freeze thaw cycle indirect tensile test, a further study of moisture susceptibility for some familiar graded HMA mixtures is carried out through modification of immersion conditions, and a new method of ...

本文以劈裂试验为基础，通过对浸水条件的改进，进一步深入地研究了几种常见沥青混合料的水稳定性，提出了以真空循环饱水条件下的沸煮劈裂试验的残留稳定度来评价沥青混合料的水稳定性。

K. H. Roscoe and his fellows of Cambridge University established the first elastoplastic model of soils which is based on classical plastic theory in 1963. However, due to the complexity of soils, the models that based on the classical metal constitutive theory or its modification accounting on the nature of soils have still much limitation when used to express the soil mechanical behavior. For example, the Duncan-Chang's model based on the generalized Hooke's law can not express the dilatancy of the soils. The uniqueness assumption of the direction of the incremental plastic strain in the classical plastic constitutive theory is not in agreement with some soil experiments.

但由于土的复杂性，目前以传统的本构理论为基础考虑土的一些特性而建立的模型在反映土体的力学特性上还存在很大的局限性，如建立于广义虎克定律基础上的Duncan—Chang模型不能反映土的剪胀性，传统的塑性本构理论中认为塑性应变增量方向具有唯一性的假设与一些土体的试验结果不符合。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。